Synchronous rectification type converter

DETAILED DESCRIPTION It is an object of the present invention to provide a synchronous rectifier circuit capable of efficiently utilizing a power supply.
In order to achieve the above object of the present invention, there is provided a synchronous rectification type converter, comprising a main transformer having a primary winding to which an unrectified input voltage is applied, a main switch connected in series with the primary winding of the main transformer, a series circuit connected in parallel with the primary winding of a main transformer and consisting of a capacitor and a clamp switch operated opposite to an operation of the main switch to clamp a reset voltage at the primary winding of the main transformer, a series circuit connected in parallel with a secondary winding of the main transformer and consisting of first and second synchronous rectifiers operated in synchronism with the operation of the main switch, a first impedance circuit arranged between a first auxiliary winding of the main transformer and a control terminal of the first synchronous rectifier, and a second impedance circuit arranged between a second auxiliary winding of the main transformer and a control terminal of the second synchronous rectifier, wherein synchronous rectification is performed in accordance with an active clamp scheme.